文献类型：期刊文献

英文题名：Synthesis and characterization of F-doped nanocrystalline Li4Ti5O12/C compounds for lithium-ion batteries

作者：Han, Xiaona[1];Zhao, Zhen[1];Xu, Yunlong[1];Liu, Dong[2];Zhang, Huang[1];Zhao, Chongjun[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China;[2]Univ Texas Arlington, Dept Mat Sci & Engn, Arlington, TX 76019 USA

年份：2014

卷号：4

期号：79

起止页码：41968

外文期刊名：RSC ADVANCES

收录：;EI(收录号：20143900070782);WOS:【SCI-EXPANDED(收录号:WOS:000342161600034)】；

基金：This work is supported by Shanghai Leading Academic Discipline Project (B502) and Shanghai Key Laboratory Project (08DZ2230500).

语种：英文

外文关键词：Solid state reactions - Coatings - Anodes - Carbon - Lithium-ion batteries - Nanocrystals - Coated materials

摘要：The F-doped and carbon coated Li4Ti5O12-xFx/C (LTOF/C) composite anode materials are synthesized via a conventional solid-state reaction with lithium citric acid as the conductive carbon source, and LiF as the fluorine source. The structure and electrochemical properties of the LTOF/C materials are investigated and the effects of carbon coating and F ion doping on the performance of as-prepared materials are discussed. Under a potential range from 0.01 to 2.5 V, LTOF/C exhibits better reversibility and higher cyclic stability compared with LTO and LTO/C, especially at high current rates. The initial specific discharge capacity is 325.6 mA h g(-1) at a current density of 170 mA g(-1), and remains about 165 mA h g(-1) over 1000 cycles when the current density increases to 850 mA g(-1). The main factors influencing the excellent performances should be attributed to the cooperation of the F-doping and carbon-coating, which can increase the amount of mixed Ti3+/Ti4+, leading to improved ionic conductivity and electron conductivity in LTO at the same time.